Plurals

I was teaching my son plurals.
"What do you say when there's more than one cow?"
"Cows."
"Very good. What do you say when there's more than one goose?"
"Geese."
"Excellent, and what do you say when there's more than one spider?"
"What do you say when there's more than one cow?"
"Cows."
"Very good. What do you say when there's more than one goose?"
"Geese."
"Excellent, and what do you say when there's more than one spider?"
Spoiler: